Henderson Corporation makes metal sheets, among other products. When the process that is used to make metal sheets works properly, 92% of the metal sheets contain no defects, 5% have one defect each, and 3% have two or more defects each. The quality control inspectors at the company take samples of metal sheets quite often and check them for defects. If the distribution of defects for a sample is significantly different from the above-mentioned percentage distribution, the process is stopped and adjusted. A recent sample of 300 sheets produced the frequency distribution of defects listed in the following table.
Does the evidence from this sample suggest that the process needs an adjustment? Use α = .01.
Answer to relevant QuestionsDescribe in your own words a test of independence and a test of homogeneity. Give one example of each. One hundred auto drivers who were stopped by police for some violations were also checked to see if they were wearing seat belts. The following table records the results of this survey. Test at a 2.5% significance level ...Four hundred people were selected from each of the four geographic regions (Midwest, Northeast, South, West) of the United States, and they were asked which form of camping they prefer. The choices were pop-up ...A sample of 21 observations selected from a normally distributed population produced a sample variance of 1.97. a. Write the null and alternative hypotheses to test whether the population variance is greater than 1.75. b. ...One of the products produced by Branco Food Company is Total-Bran Cereal, which competes with three other brands of similar total-bran cereals. The company’s research office wants to investigate if the percentage of people ...
Post your question